@misc{1187056,
  author = {Paul A Hudson},
  title = {The National Measurement System for medical ultrasonics:},
  year = {1976},
  month = {1976-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.75-937},
  language = {en},
}